Drilling mechanism



Oct. 24, 1933. E. G. GARTIN 1,931,535

DRILLING MECHANISM Filed March 22, 1930 Patented Oct. 2.4, 1933 uNiTEo STATES DRILLING MEoHANisM ElmerG. Gartin, Claremont, N. H., assigner to Sullivan Machinery Company, a corporation of Massachusetts Application March 22, 1930. Serial No. 438,129

7 creams. (o1. 121-36) This invention relates to drilling mechanism and more particularly to improved hand supporting means therefor and particularly to ii-- prcved means whereby a given type of tool may be used for a plurality of purposes each of which generally necessitates the use of special types of tools. f

Anobject of myinvention is to provide an improved arrangement for yieldably supporting a drilling'mechanism. AA further and more specic object is to provide an improved arrangement which is particularly adapted for supporting the drilling mechanism by hand and to accomplish the same by relatively simple yand inexpensive means-'and without the alteration of an existing type of mechanism, although it will be understood thatl tools may be specially constructed for my improved combination. A further and more specific object is toprovide a novel arrangement of parts whereby an existing type of drilling mechanism such as a drifter may embody my improved yieldable hand support. f

Further objects and advantages will be ob'- vious to those skilled in the art from the -following description of the accompanying drawing, in which,-

Fig. l nism with my improved handle support associated therewith, and part of which is shown in section to show details of construction.

Fig. 2 is a fragmentary side View of Fig. 1 looking upwardly from the bottom thereof.

Fig. 3 is an end view of Fig. 2 looking toward the handle.

Fig. 4 is a transverse section taken on line 4 4 of Fig. 2 with the drilling motor shown on the top.

Fig. 5 is a longitudinal fragmentary section taken substantially on line 5 5 of Figs. 2 and 4.

In the illustrative embodiment of my invention I have shown for purposes of illustration a drilling mechanism generally indicated 1 and preferably of the driftertype having for instance the usual hammer piston, steel chuck, rear head and other well-known elements including side'gibs 2 and a depending boss 3 in which is normally disposed a feed nut for cooperation with a feed screw. The screw is carried normally by a shell which suitably slidably supports the drilling mechanism l by the gibs 2. In order to eiTect improved means for permitting use of the drilling mechanism either as a drifter or a hand supported tool, there is provided in my improved aris'a side elevation of a drilling mechawithin the boss 3.

tion 4 with a central opening to receive the reduced end of a bolt 5 which is insertable within the bore of the boss 3. The outer end of the reduced portion ofthe bolt 5 is held by a nut 6. The outer ends of the transverse member e each carry a longitudinally extending spring container `'1. These containers are disposed parallel to each other and each has a partition 8 between the bores 9 and l0 therein. Rods .1l extend through suitable openings in the partitions 8 and are each guided at the lower end by a washer 12 surrounding the rod and slidably engaging the walls of the bore 9, while the upper ends of the rods have enlarged bosses 13 slidably engaging the walls of the bores 10 and rigidly connected with the rods and also with the handle brackets 14 to which a usual type of handle 15 is connected. The handle may be of any suitable form `but is preferably of type having a series of alined tubular members all 'of which are connected by a common bolt l5 4passing from one end to the other. Springs 17 and 18 are disposed in each of the bores and the tension thereof is adjusted by nuts 19 threaded on the ends ofthe rods 11. To prevent rotation of the handle bracket relative to the drilling mechanism, the transverse bracket portion 4 engages a flattened portion 20 vformed on the rear cylinder head 21 while the head of the bolt 5 engages a flattened portion 22. When the tool is used as a drifter the flattened portions 20 and 22 are engaged by the feed screw nut disposed However by removing the nut I am able to utilize these flattened portions and thus prevent rotation of the handle structure relative to the drilling mechanism without in any way necessitating the use of further elements engaging the drilling mechanism as has heretofore been necessary. It is also seen that by my improved arrangement employing the spring housings 7 a structure is provided of shorter length than has heretofore been used due to the fact that the necessary axially spaced guiding surfaces for the handle rods are obtained by the boss 13, washer 12 and partition 8 thereby keeping the length of the structure down to practically only that required by. the springs 17 and 18.

While there is in this application sepcically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modied and embodied in Various other formswithout departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A drilling mechanism'of the type having a boss projecting therefrom substantially near the rear end thereof, a handle guide bracket bolted to said boss and having a pair of parallel longitudinally extending spring casings each provided with an intermediate apertured partition, a handle, and means for yieldably supporting said handle by said bracket including rods, one foreach of said spring casings, extending throughout the casing bores and having a slidable guiding connection with the end portions of their respective casings, and springs interposed between said partition and each end of said rods. I

2. A drilling mechanism comprising a drilling motor having a rear head with a flattened portion and a boss projecting radially from said motor at a point near the rear end thereof, a bracket rigidly connected to saidboss and having engagement with said ilattened portion, a handle, and meansfor yieldably supporting said handle by said bracket including a pair of parallel rods slidably extending through apertures insaid bracket and springs associated with each of said rods and on opposite sides of said bracket. Y

3. In combination, a drilling `motor or" the drifter type, having gibs arranged to cooperate with a shell and also having means for supporting a feed nut non-rotatively thereon including means affording a surface engageable by a feed nut to prevent rotation ci the latter, a bracket having a surface engageablerwith said rst mentioned surface to prevent rotation of said bracket, means for securing said bracket to said motor with said surfaces in` abutment, and ahandle yeldably supported by said bracket and having a slidable connection with the latter including a pair of guiding elements eX- tending parallel to the gibs and adjacent to but spaced from the latter.

Il. A drilling mechanism of the drifter type having a feed nut boss-and gibs extending 'longitudinally of the drill, a handle, a bracket rigidly secured to the feed nut boss and having a securing element extending into the feed nut boss, said bracket having a flattened surface engaging a attened surface on 'the drill for preventing rotative movement of the bracket relative to the drill, and a resilient shock absorbing connection between said handle and bracket.

5. .A drilling mechanism of the drifter type having VVa feednut boss, a flattened surface on the drill adapted normally to prevent rotation of a feed nut in said boss, and gibs extending longitudinally of the drill, a handle, a bracket rigidly secured to the feed nut boss and having 'a securing element extending into the Afeed nut boss, said bracket having a flattened surface engaging said flattened surface on the drill for preventing rotative movement of the bracket relative to the drill, and a resilientshock absorbing connection between said handle and said bracket.

6. A drilling mechanism of the drifter type having a feed' nut boss and gibs extending longitudinally of the drill, a handle, a bracket rigidly secured to the feed nut boss and engaging a part of the drill for preventing rotative movement thereof relative to the drill, said bracket having parallel longitudinal guide portions arranged parallel with and. contiguousy to ,but spaced from the drill gibs, bolts slidably guided in said guide portions of said bracket, and springs interposed between said` bracket and handle and encircling said bolts, said guide portions having chambers in which the springs are arranged and forming a housing for the springs and said bolts carrying devices slidably cooperating With the walls of said chambers to position the handle.

7. In combination.a drilling motor, a handle, and means for resiliently slidably connecting said handle and motor including parallel guideways each providing a pair of alined bores separated by a perforated partition, rods connected with said handle and extending through said perforated partition, springs surrounding said rods and disposed one in each of Ysaidbores, and guiding means tting said boresand enclosing the springs thereinand moving with and guiding said rods during relative `longitudinal movement between the latter and said guideways.

ELMER G. GARTIN. 

